ngx-highlightjs
Version:
Instant code highlighting, auto-detect language, super easy to use.
138 lines • 19.5 kB
JavaScript
import { Injectable, Inject, PLATFORM_ID, Optional } from '@angular/core';
import { DOCUMENT, isPlatformBrowser } from '@angular/common';
import { BehaviorSubject, from, EMPTY, zip, throwError } from 'rxjs';
import { catchError, tap, map, switchMap, filter, take } from 'rxjs/operators';
import { HIGHLIGHT_OPTIONS } from './highlight.model';
import * as i0 from "@angular/core";
// @dynamic
export class HighlightLoader {
constructor(doc, platformId, _options) {
this.doc = doc;
this._options = _options;
// Stream that emits when hljs library is loaded and ready to use
this._ready = new BehaviorSubject(null);
this.ready = this._ready.asObservable().pipe(filter((hljs) => !!hljs), map((hljs) => hljs), take(1));
if (isPlatformBrowser(platformId)) {
// Check if hljs is already available
if (doc.defaultView.hljs) {
this._ready.next(doc.defaultView.hljs);
}
else {
// Load hljs library
this._loadLibrary().pipe(switchMap((hljs) => {
if (this._options && this._options.lineNumbersLoader) {
// Make hljs available on window object (required for the line numbers library)
doc.defaultView.hljs = hljs;
// Load line numbers library
return this.loadLineNumbers().pipe(tap(() => this._ready.next(hljs)));
}
else {
this._ready.next(hljs);
return EMPTY;
}
}), catchError((e) => {
console.error('[HLJS] ', e);
return EMPTY;
})).subscribe();
}
// Load highlighting theme
if (this._options?.themePath) {
this.loadTheme(this._options.themePath);
}
}
}
/**
* Lazy-Load highlight.js library
*/
_loadLibrary() {
if (this._options) {
if (this._options.fullLibraryLoader && this._options.coreLibraryLoader) {
return throwError(() => 'The full library and the core library were imported, only one of them should be imported!');
}
if (this._options.fullLibraryLoader && this._options.languages) {
return throwError(() => 'The highlighting languages were imported they are not needed!');
}
if (this._options.coreLibraryLoader && !this._options.languages) {
return throwError(() => 'The highlighting languages were not imported!');
}
if (!this._options.coreLibraryLoader && this._options.languages) {
return throwError(() => 'The core library was not imported!');
}
if (this._options.fullLibraryLoader) {
return this.loadFullLibrary();
}
if (this._options.coreLibraryLoader && this._options.languages && Object.keys(this._options.languages).length) {
return this.loadCoreLibrary().pipe(switchMap((hljs) => this._loadLanguages(hljs)));
}
}
return throwError(() => 'Highlight.js library was not imported!');
}
/**
* Lazy-load highlight.js languages
*/
_loadLanguages(hljs) {
const languages = Object.entries(this._options.languages).map(([langName, langLoader]) => importModule(langLoader()).pipe(tap((langFunc) => hljs.registerLanguage(langName, langFunc))));
return zip(...languages).pipe(map(() => hljs));
}
/**
* Import highlight.js core library
*/
loadCoreLibrary() {
return importModule(this._options.coreLibraryLoader());
}
/**
* Import highlight.js library with all languages
*/
loadFullLibrary() {
return importModule(this._options.fullLibraryLoader());
}
/**
* Import line numbers library
*/
loadLineNumbers() {
return importModule(this._options.lineNumbersLoader());
}
/**
* Reload theme styles
*/
setTheme(path) {
this._themeLinkElement.href = path;
}
/**
* Load theme
*/
loadTheme(path) {
this._themeLinkElement = this.doc.createElement('link');
this._themeLinkElement.href = path;
this._themeLinkElement.type = 'text/css';
this._themeLinkElement.rel = 'stylesheet';
this._themeLinkElement.media = 'screen,print';
this.doc.head.appendChild(this._themeLinkElement);
}
}
HighlightLoader.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "14.1.0", ngImport: i0, type: HighlightLoader, deps: [{ token: DOCUMENT }, { token: PLATFORM_ID }, { token: HIGHLIGHT_OPTIONS, optional: true }], target: i0.ɵɵFactoryTarget.Injectable });
HighlightLoader.ɵprov = i0.ɵɵngDeclareInjectable({ minVersion: "12.0.0", version: "14.1.0", ngImport: i0, type: HighlightLoader, providedIn: 'root' });
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "14.1.0", ngImport: i0, type: HighlightLoader, decorators: [{
type: Injectable,
args: [{
providedIn: 'root'
}]
}], ctorParameters: function () { return [{ type: undefined, decorators: [{
type: Inject,
args: [DOCUMENT]
}] }, { type: undefined, decorators: [{
type: Inject,
args: [PLATFORM_ID]
}] }, { type: undefined, decorators: [{
type: Optional
}, {
type: Inject,
args: [HIGHLIGHT_OPTIONS]
}] }]; } });
/**
* Map loader response to module object
*/
const importModule = (moduleLoader) => {
return from(moduleLoader).pipe(filter((module) => !!module && !!module.default), map((module) => module.default));
};
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{ Injectable, Inject, PLATFORM_ID, Optional } from '@angular/core';\r\nimport { DOCUMENT, isPlatformBrowser } from '@angular/common';\r\nimport { BehaviorSubject, Observable, from, EMPTY, zip, throwError } from 'rxjs';\r\nimport { catchError, tap, map, switchMap, filter, take } from 'rxjs/operators';\r\nimport { HIGHLIGHT_OPTIONS, HighlightLibrary, HighlightOptions } from './highlight.model';\r\n\r\n// @dynamic\r\n@Injectable({\r\n  providedIn: 'root'\r\n})\r\nexport class HighlightLoader {\r\n  // Stream that emits when hljs library is loaded and ready to use\r\n  private readonly _ready = new BehaviorSubject<HighlightLibrary | null>(null);\r\n  readonly ready: Observable<HighlightLibrary> = this._ready.asObservable().pipe(\r\n    filter((hljs: HighlightLibrary | null) => !!hljs),\r\n    map((hljs: HighlightLibrary | null) => hljs as HighlightLibrary),\r\n    take(1)\r\n  );\r\n\r\n  private _themeLinkElement: HTMLLinkElement;\r\n\r\n  constructor(@Inject(DOCUMENT) private doc: any,\r\n              @Inject(PLATFORM_ID) platformId: object,\r\n              @Optional() @Inject(HIGHLIGHT_OPTIONS) private _options: HighlightOptions) {\r\n    if (isPlatformBrowser(platformId)) {\r\n      // Check if hljs is already available\r\n      if (doc.defaultView.hljs) {\r\n        this._ready.next(doc.defaultView.hljs);\r\n      } else {\r\n        // Load hljs library\r\n        this._loadLibrary().pipe(\r\n          switchMap((hljs: HighlightLibrary) => {\r\n            if (this._options && this._options.lineNumbersLoader) {\r\n              // Make hljs available on window object (required for the line numbers library)\r\n              doc.defaultView.hljs = hljs;\r\n              // Load line numbers library\r\n              return this.loadLineNumbers().pipe(tap(() => this._ready.next(hljs)));\r\n            } else {\r\n              this._ready.next(hljs);\r\n              return EMPTY;\r\n            }\r\n          }),\r\n          catchError((e: any) => {\r\n            console.error('[HLJS] ', e);\r\n            return EMPTY;\r\n          })\r\n        ).subscribe();\r\n      }\r\n\r\n      // Load highlighting theme\r\n      if (this._options?.themePath) {\r\n        this.loadTheme(this._options.themePath);\r\n      }\r\n    }\r\n  }\r\n\r\n  /**\r\n   * Lazy-Load highlight.js library\r\n   */\r\n  private _loadLibrary(): Observable<any> {\r\n    if (this._options) {\r\n      if (this._options.fullLibraryLoader && this._options.coreLibraryLoader) {\r\n        return throwError(() => 'The full library and the core library were imported, only one of them should be imported!');\r\n      }\r\n      if (this._options.fullLibraryLoader && this._options.languages) {\r\n        return throwError(() => 'The highlighting languages were imported they are not needed!');\r\n      }\r\n      if (this._options.coreLibraryLoader && !this._options.languages) {\r\n        return throwError(() => 'The highlighting languages were not imported!');\r\n      }\r\n      if (!this._options.coreLibraryLoader && this._options.languages) {\r\n        return throwError(() => 'The core library was not imported!');\r\n      }\r\n      if (this._options.fullLibraryLoader) {\r\n        return this.loadFullLibrary();\r\n      }\r\n      if (this._options.coreLibraryLoader && this._options.languages && Object.keys(this._options.languages).length) {\r\n        return this.loadCoreLibrary().pipe(switchMap((hljs: HighlightLibrary) => this._loadLanguages(hljs)));\r\n      }\r\n    }\r\n    return throwError(() => 'Highlight.js library was not imported!');\r\n  }\r\n\r\n  /**\r\n   * Lazy-load highlight.js languages\r\n   */\r\n  private _loadLanguages(hljs: HighlightLibrary): Observable<any> {\r\n    const languages = Object.entries(this._options.languages).map(([langName, langLoader]: [string, () => Promise<any>]) =>\r\n      importModule(langLoader()).pipe(\r\n        tap((langFunc: any) => hljs.registerLanguage(langName, langFunc))\r\n      )\r\n    );\r\n    return zip(...languages).pipe(map(() => hljs));\r\n  }\r\n\r\n\r\n  /**\r\n   * Import highlight.js core library\r\n   */\r\n  private loadCoreLibrary(): Observable<HighlightLibrary> {\r\n    return importModule(this._options.coreLibraryLoader!());\r\n  }\r\n\r\n  /**\r\n   * Import highlight.js library with all languages\r\n   */\r\n  private loadFullLibrary(): Observable<HighlightLibrary> {\r\n    return importModule(this._options.fullLibraryLoader!());\r\n  }\r\n\r\n  /**\r\n   * Import line numbers library\r\n   */\r\n  private loadLineNumbers(): Observable<any> {\r\n    return importModule(this._options.lineNumbersLoader!());\r\n  }\r\n\r\n  /**\r\n   * Reload theme styles\r\n   */\r\n  setTheme(path: string): void {\r\n    this._themeLinkElement.href = path;\r\n  }\r\n\r\n  /**\r\n   * Load theme\r\n   */\r\n  private loadTheme(path: string): void {\r\n    this._themeLinkElement = this.doc.createElement('link');\r\n    this._themeLinkElement.href = path;\r\n    this._themeLinkElement.type = 'text/css';\r\n    this._themeLinkElement.rel = 'stylesheet';\r\n    this._themeLinkElement.media = 'screen,print';\r\n    this.doc.head.appendChild(this._themeLinkElement);\r\n  }\r\n}\r\n\r\n/**\r\n * Map loader response to module object\r\n */\r\nconst importModule = (moduleLoader: Promise<any>): Observable<any> => {\r\n  return from(moduleLoader).pipe(\r\n    filter((module: any) => !!module && !!module.default),\r\n    map((module: any) => module.default)\r\n  );\r\n};\r\n"]}